Burglar alarm



M. MACURA BURGLARALARM Oct. 9, 1923.

Filed July 18, 1925 Y Patented Get. 9, 1923.

' UNITED STATES MIKE MACURA, OF HASTINGS-ON-HUDSON, NEW YORK.

BURGLAR ALARM.

Application filed July 18,

T all whom it may concern:

Be it known that I, MIKE MAOURA, a citizen of Czechoslovakia, residing at Hastingson-Hudson, in the county of Weschester and State of New York, have invented certain new and useful Improvements in Burglar Alarms, of which the following is a specification.

This invention relates to new and useful improvements in burglar alarms. An important object of the invention is to provide an alarm that is adapted for giving warning of the unauthorized opening of a door by a burglar or other intruder.

A further object of the invention is to provide an alarm that is adapted for being positioned upon the floor of a room in proX imity to a closed door in such a manner that when the door is opened the alarm will be operated.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevational view of the burglar alarm properly positioned in respect to the fragmentary portion of a door that is shown in vertical section,

Figure 2 is a top plan view of the alarm shown in Fig. 1 with the door shown upon line IIII of Fig. 1, and

Figure 3 is a vertical sectional view taken on line III-III of Fig. 1.

In the accompanying drawing, wherein for the purpose of illustration is shown a preferred embodiment of this invention, the numeral 5 designates the floor of a room having a door sill 6 suitably mounted thereon in operative relation with the door 7.

The alarm embodying this invention consists of a substantially wedge-shaped frame portion that is designated in general by the numeral 8 and is formed from a sheet of metal that is properly cut and bent to provide a substantially rectangularly-shaped fiat base portion 9 which is cut at desired points to form the depending spears or points 10 which are employed for connec ing the wedge-shaped frame to the substantially rectangularly-shaped block of rubber 11. One end of this flat base portion is bent to extend at an obtuse angle to the said base portion 9 and is designated by the 1923. Serial No. 652,323.

numeral 12. This angularly arranged portion 12 is suitably formed or molded to provide the longitudinally extending rib 13 which is employed for reinforcing the said portion 12. The upper end of this angularly arranged top portion 12 is bifurcated for forming the downwardly inclined end por tion 14 and for forming the substantially L- shaped depending leg 15. The opposite end of the base portion 9 is bent upon itself, as at 16 and is then bent at right angles to the base portion 9 for providing a vertically extending bracket portion 17 which is formed with an integral flange 18 to which is bolted the bicycle bell 19 which is provided with the usual operating button 20. The remaining end of this sheet or strip of metal is bent to underlie the angularly arranged top portion 12 for forming a resilient stop for the same which I will designate by the numeral 21. The free end of this stop 21 is arcuately bent, as at 22 for providing a leg that will strike the upper surface of the base plate 9 when moved thereagainst. It will be seen by inspecting the various figures that the L- shaped depending leg will normally engage the bell operating button 20.

When the burglar alarm is positioned in close proximity to a door with the rubber block 11 frictionally engaging the floor, as shown in Fig. 1, the movement of the door 7 to the dotted line position shown will cause the lower transverse edge of the said door to strike the angularly arranged top portion 12 of the frame 8. This striking of the top portion 12 will cause the same to be forced downwardly in respect to the base 9 for causing the depending L-shaped leg 15 to move the bell operating button downwardly for sounding the said bell. Should the portion 12 be forced downwardly until it engages the stop 21, the resiliency of this stop will aid in returning the angularly arranged top portion 12 to its normal position. The arcuate end 22 of the stop 21 will prevent the angularly arranged top portion 12 from moving too great a distance downwardly in the direction of the base plate 9.

It is to be understood that the form of this invention herewith shown and described is to be taken as the preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claim.

angularly arranged portion adapted for engaging said operating button for sounding said bell When the angularly arranged portion is moved inthe direction of said base portion, and a movement limiting arm carried by said bracket member for preventing too great a downward movement of said angularly arranged portion.

In testimony whereof I afliX my signature.

' NII'KE MAGURA. 

